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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/time.h>
8#include <linux/gcd.h>
9#include <sound/core.h>
10#include <sound/pcm.h>
11#include <sound/timer.h>
12
13#include "pcm_local.h"
14
15/*
16 * Timer functions
17 */
18
19void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
20{
21 unsigned long rate, mult, fsize, l, post;
22 struct snd_pcm_runtime *runtime = substream->runtime;
23
24 mult = 1000000000;
25 rate = runtime->rate;
26 if (snd_BUG_ON(!rate))
27 return;
28 l = gcd(mult, rate);
29 mult /= l;
30 rate /= l;
31 fsize = runtime->period_size;
32 if (snd_BUG_ON(!fsize))
33 return;
34 l = gcd(rate, fsize);
35 rate /= l;
36 fsize /= l;
37 post = 1;
38 while ((mult * fsize) / fsize != mult) {
39 mult /= 2;
40 post *= 2;
41 }
42 if (rate == 0) {
43 pcm_err(substream->pcm,
44 "pcm timer resolution out of range (rate = %u, period_size = %lu)\n",
45 runtime->rate, runtime->period_size);
46 runtime->timer_resolution = -1;
47 return;
48 }
49 runtime->timer_resolution = (mult * fsize / rate) * post;
50}
51
52static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
53{
54 struct snd_pcm_substream *substream;
55
56 substream = timer->private_data;
57 return substream->runtime ? substream->runtime->timer_resolution : 0;
58}
59
60static int snd_pcm_timer_start(struct snd_timer * timer)
61{
62 struct snd_pcm_substream *substream;
63
64 substream = snd_timer_chip(timer);
65 substream->timer_running = 1;
66 return 0;
67}
68
69static int snd_pcm_timer_stop(struct snd_timer * timer)
70{
71 struct snd_pcm_substream *substream;
72
73 substream = snd_timer_chip(timer);
74 substream->timer_running = 0;
75 return 0;
76}
77
78static struct snd_timer_hardware snd_pcm_timer =
79{
80 .flags = SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_SLAVE,
81 .resolution = 0,
82 .ticks = 1,
83 .c_resolution = snd_pcm_timer_resolution,
84 .start = snd_pcm_timer_start,
85 .stop = snd_pcm_timer_stop,
86};
87
88/*
89 * Init functions
90 */
91
92static void snd_pcm_timer_free(struct snd_timer *timer)
93{
94 struct snd_pcm_substream *substream = timer->private_data;
95 substream->timer = NULL;
96}
97
98void snd_pcm_timer_init(struct snd_pcm_substream *substream)
99{
100 struct snd_timer_id tid;
101 struct snd_timer *timer;
102
103 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
104 tid.dev_class = SNDRV_TIMER_CLASS_PCM;
105 tid.card = substream->pcm->card->number;
106 tid.device = substream->pcm->device;
107 tid.subdevice = (substream->number << 1) | (substream->stream & 1);
108 if (snd_timer_new(substream->pcm->card, "PCM", &tid, &timer) < 0)
109 return;
110 sprintf(timer->name, "PCM %s %i-%i-%i",
111 substream->stream == SNDRV_PCM_STREAM_CAPTURE ?
112 "capture" : "playback",
113 tid.card, tid.device, tid.subdevice);
114 timer->hw = snd_pcm_timer;
115 if (snd_device_register(timer->card, timer) < 0) {
116 snd_device_free(timer->card, timer);
117 return;
118 }
119 timer->private_data = substream;
120 timer->private_free = snd_pcm_timer_free;
121 substream->timer = timer;
122}
123
124void snd_pcm_timer_done(struct snd_pcm_substream *substream)
125{
126 if (substream->timer) {
127 snd_device_free(substream->pcm->card, substream->timer);
128 substream->timer = NULL;
129 }
130}
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <linux/time.h>
23#include <linux/gcd.h>
24#include <sound/core.h>
25#include <sound/pcm.h>
26#include <sound/timer.h>
27
28/*
29 * Timer functions
30 */
31
32void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
33{
34 unsigned long rate, mult, fsize, l, post;
35 struct snd_pcm_runtime *runtime = substream->runtime;
36
37 mult = 1000000000;
38 rate = runtime->rate;
39 if (snd_BUG_ON(!rate))
40 return;
41 l = gcd(mult, rate);
42 mult /= l;
43 rate /= l;
44 fsize = runtime->period_size;
45 if (snd_BUG_ON(!fsize))
46 return;
47 l = gcd(rate, fsize);
48 rate /= l;
49 fsize /= l;
50 post = 1;
51 while ((mult * fsize) / fsize != mult) {
52 mult /= 2;
53 post *= 2;
54 }
55 if (rate == 0) {
56 snd_printk(KERN_ERR "pcm timer resolution out of range (rate = %u, period_size = %lu)\n", runtime->rate, runtime->period_size);
57 runtime->timer_resolution = -1;
58 return;
59 }
60 runtime->timer_resolution = (mult * fsize / rate) * post;
61}
62
63static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
64{
65 struct snd_pcm_substream *substream;
66
67 substream = timer->private_data;
68 return substream->runtime ? substream->runtime->timer_resolution : 0;
69}
70
71static int snd_pcm_timer_start(struct snd_timer * timer)
72{
73 struct snd_pcm_substream *substream;
74
75 substream = snd_timer_chip(timer);
76 substream->timer_running = 1;
77 return 0;
78}
79
80static int snd_pcm_timer_stop(struct snd_timer * timer)
81{
82 struct snd_pcm_substream *substream;
83
84 substream = snd_timer_chip(timer);
85 substream->timer_running = 0;
86 return 0;
87}
88
89static struct snd_timer_hardware snd_pcm_timer =
90{
91 .flags = SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_SLAVE,
92 .resolution = 0,
93 .ticks = 1,
94 .c_resolution = snd_pcm_timer_resolution,
95 .start = snd_pcm_timer_start,
96 .stop = snd_pcm_timer_stop,
97};
98
99/*
100 * Init functions
101 */
102
103static void snd_pcm_timer_free(struct snd_timer *timer)
104{
105 struct snd_pcm_substream *substream = timer->private_data;
106 substream->timer = NULL;
107}
108
109void snd_pcm_timer_init(struct snd_pcm_substream *substream)
110{
111 struct snd_timer_id tid;
112 struct snd_timer *timer;
113
114 tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
115 tid.dev_class = SNDRV_TIMER_CLASS_PCM;
116 tid.card = substream->pcm->card->number;
117 tid.device = substream->pcm->device;
118 tid.subdevice = (substream->number << 1) | (substream->stream & 1);
119 if (snd_timer_new(substream->pcm->card, "PCM", &tid, &timer) < 0)
120 return;
121 sprintf(timer->name, "PCM %s %i-%i-%i",
122 substream->stream == SNDRV_PCM_STREAM_CAPTURE ?
123 "capture" : "playback",
124 tid.card, tid.device, tid.subdevice);
125 timer->hw = snd_pcm_timer;
126 if (snd_device_register(timer->card, timer) < 0) {
127 snd_device_free(timer->card, timer);
128 return;
129 }
130 timer->private_data = substream;
131 timer->private_free = snd_pcm_timer_free;
132 substream->timer = timer;
133}
134
135void snd_pcm_timer_done(struct snd_pcm_substream *substream)
136{
137 if (substream->timer) {
138 snd_device_free(substream->pcm->card, substream->timer);
139 substream->timer = NULL;
140 }
141}